Method of forming spray nozzle disks



Sept. 20, 1938. T. w. MURPHY METHOD OF FORMING SPRAY NOZZLE DISKS Filed Feb. 4, 1957 my m P wR U M S A M m T TORNEY Patented Sept. 20, 1938 PATENT OFFICE METHOD OF FORMING SPRAY NOZZLE DISKS Thomas W. Murphy, Bala-Cynwyd, Pa., assignor to Monarch Manufacturing Works, Inc., Philadelphia, Pa., a corporation of Delaware Application February 4, 1937, Serial No. 124,003

Claims.

This invention relates to spray nozzles, and has particular reference to that part thereof known in the trade as the disk, and which element is designed to give to thefiuid to be 5 sprayed, a swirling atomizing action.

In order that this invention may be better understood, reference may be had to my United States Letters Patent No. 1,982,228, granted November 27, 1934, and entitled Nozzle.

While the nozzle herein described is capable of substantial universal use for spraying liquids, it is designed primarily as a spray nozzle for oil burners, although it is not limited in anyway .to that class of service.

The object of the present invention is to provide a disk in which the swirl chamber is precisely concentric with respect to the annular tapered seat around the same. Another object of the invention is to locate the 20 swirl chamber with precision so that the kerfs which extend. through the annular tapered seat and which admit liquid to said chamber may be uniform.

According to the invention, a metal plug of desired diameter is subjected to an upsetting process wherein a die is formed thereon, said die having a crater or swirl chamber located in the end thereof and having a surrounding concentric tapered seat, and a tail tapering so that its outer end is of less diameter. The tapered seat may also be provided, during this same operation, with kerfs tangential to and connecting with said chamber, and the seat may then be narrowed by removing excess material. If desired, the kerfs .5 may be placed in said disk after the upsetting process.

The drawing illustrates an embodiment of the invention, and the views therein are as foll0ws:--,

Figure 1 is. a view largely in vertical section of the complete nozzle, certain parts thereof being shown in broken elevation,

Figure 2 is a View showing the die in section, and just before the upsetting operation,

Figure 3 is a like view showing the completion of the upsetting operation,

Figure 4 is a side view of a completed disk,

Figure 5 is a top plan view of the same,

Figure 6 is a cross-sectional View of a die incorporating means for forming the kerfs in the tapered seat of said disk.

Like symbols of reference herein indicate like parts in each of the figures of the drawing.

The housing [0, of substantially the usual type, is provided with a thread ll of such type as to receive the fittings upon which the device is to be employed. It is also provided with a threaded part I2 into which the threaded part I3 of the tip I4 is inserted. This tip I4 is hollow, and is provided with an axial bore l5 which, in the embodiments shown in Figure 1, merges from a substantially conical bore 16. This tip I4 is also internally screw threaded at IT to receive a sleeve l8, which has a threaded enlargement l9 and an extension 2| of smaller diameter provided with a screw driver slot 22 for inserting and withdrawing the sleeve. This enlargement has a hole bored through the same. The sleeve I8 is slitted at 23, and the slits may be of any desired number. A terminal member or disk 24 is provided with an enlargement or head 26, which has a tapered face or seat 21 which fits against alike face on the inner wall of the tip, so thatno liquid can pass between these parts,exceptthrough kerfs 28 which extend across this face tangential to and connecting with a crater or swirl chamber 29, which must be precisely concentric with the tapered seat.

Behind the tapered seat 21 is another tapered part 3|, no part of which engages the inner wall of the tip, so that liquid is free to circulate around the same, and pass into the keifs on the tapered seat, and into the swirl chamber in the end of said disk. The tail 32 of said disk fits within the slitted sleeve l8, and this tail has a slight taper, the outer end thereof being the smaller in diameter. The tail of the disk is shorter than the sleeve, so that liquid may pass through the bore 20 and through the slits 23 to find its way to the kerfs 28 in the disk 24.

While the spray nozzle is complete for most classes of work in the elements just described, it is advisable when used in oil burner work to provide the same with a strainer which, in the present instance, has a threaded part 33 and a barrel completely surrounded by wire gauze and having holes 34 extending through the same, while its outer end is provided with a knurled portion 36 for inserting or withdrawing the said strainer. The present invention centers itself about the disk 24 and has to do with the process of forming this disk.

It has been a matter of great difiiculty to manufacture disks wherein the crater or swirl chamber was precisely and accurately concentric with the tapered seat surrounding same. It will be apparent to those skilled in the art that in order to effectively swirl liquid for atomization that the relationship between the kerfs and the swirl chamber must be uniform.

Various methods of forming the swirl chamber were devised, but the number of faulty disks was not greatly decreased.

It will, of course, be understood that while the drawing shows the kerfs to be of some considerable width, in reality the entire disk is many times smaller than the illustration, and the kerfs are substantially finer than shown. Even when the disk was placed in a collet clutch for forming the swirl chamber, it was found that when the disk was then placed in the apparatus for cutting the kerfs that the inner end of some of these kerfs would lie on the rim of the swirl chamber, or would not extend through this rim, thereby destroying the very purpose for which the disk was designed.

These disks are now made from the following operation.

Referring to Figure 2, a small metallic plug 3?, cut from rod stock is dropped into a tapered die 40 and an upsetting die 39 adapted to engage the end 38, so as to form the same as shown in Figure 3 with the crate-like swirl chamber 29 accurately and precisely located with respect to the tapered part 4|, which eventually will be: the

seat 21. During this same action, the tail 32 has been given a slight taper, the outer end having the smaller diameter, so that said tail will leave the die, and may be readily pressed into the sleeve M3 for assembling.

Figure 4 shows the completed disk in which excess material has been removed from the head, so as to narrow the seat 21. The disk may now be subjected to the mechanism which forms the kerfs therein, and as the swirl chamber and seat are precisely concentric, every kerf will be uniform with relation to the seat and chamber.

Figure 6 shows another upsetting die having blades 42 for forming the kerfs during the upsetting operation.

Of course, the process herein illustrated and described may be modified without departing from a cylindrical metal plug having a tapered end, comprising the upsetting of the tapered end of said plug to form a conical seat of a different angle than the original taper, simultaneously forming a swirl chamber within and concentric with said seat, and forming the cylindrical end of said plug into a tapered tail.

3. The method of forming a spray nozzle disk comprising the upsetting of one end of a metal plug to form a tapered seat and simultaneously forming in the tapered end thereof a concentric .swirl chamber, and forming the balance of said plug in atapered tail.

4. The method of forming a spray nozzle disk comprising the upsetting of one end of a metal plug to form a tapered seat and simultaneously forming in the tapered end thereof a concentric swirl chamber, forming the balance of said plug into a tapered tail, and then removing part of said tapered seat to. form a different taper.

5. The method of forming a spray nozzle disk from a cylindrical metal plug having a tapered end, comprising the upsetting of the tapered end of said plug toform a conical seat of diiferent angle than the original taper, simultaneously forming a swirl chamber within and concentric with said seat, and kerfs tangential to, and connecting with said chamber, and forming the cylindrical end of said plug into a tapered tail.

THOMAS W. MURPHY.

CERTIFICATE OF CORRECTION.

Patent No. 2,150,85h. September 20, 1938.

of the above numbered patent requiring correction as follows Page 2, second column, line 1h, claim 2, before the syllable "dif-" strike out the article "a"; line 2h,, claim 5,, for "in" .read into; and for the claims now numbered 1, 2, 5 and h read 5, L 1 and 2 respectively; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

